. Why can some devices be used with a 0% dead battery as long as they’re plugged in, while others have to be charged a bit first?
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Doing both (charging and using) add more cost and more space. In some rare case it could be as a safety measures
Like for an electric razor, likely to be used in a bathroom, maybe with water around, and using it while plugged may not be the best idea. (even if I’m pretty sure it is also, nowday, to cheap out since in north America we are likely to have GFCI plugs. Though I have no clue about the international market and how easy we can sue them internationally).
For a cellphone, space is already a big issues so they want to cut that.
Well, for why some have to be charged a bit, it has to do with the boot up process.
For things that won’t turn back on right away after you plug them in, that is a fail safe built into the device by the manufacturer. Because for things like an iPhone, if the phone were to die/run out of battery again in the middle of it booting up/turning back on, there’s a chances that it could seriously screw up the phones computer.
So to just prevent that from happening and dealing with angry customers, they force the phone to reach a certain amount of charge so it doesn’t die while booting up.
Other devices don’t have that same problem, so they can turn on right away
It’s a design tradeoff. Some devices are expected to be used while being charged while others aren’t. With the latter case, you could save costs by making it charge the batteries offline.
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